Yuck! Science Kit. This kit definitely gets our highest yuck-rating, but seriously there are valuable science lessons in this specimen jar! Kids will learn the secret formulas for making realistic looking snot, vomit, worm guts and more ooey, gooey things. After all, how often does a kid get a chance to grow his own bacteria farm in a petri dish? Specimen jar includes slime goo, worm goo, slime activator, worm activator, True Colors™ tablets, growing body parts, petri dish and lid, nutrient agar, cotton swab, clear cup, mixing cups, super absorbent crystals and instructions.